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Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
3,731
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Backends
17
Loaded from pysigma-node
pySigma Versions
10
Newest: 1.3.3
Translation Workspace
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Active Rule
NET NGenAssemblyUsageLog Registry Key Tamper
Target Profile
Splunk
Splunk through pysigma-backend-splunk.
Format Mode
Default
Default pySigma output mode for this backend.
Conversion Output
NET NGenAssemblyUsageLog Registry Key Tamper
Using Splunk · Default · pySigma 1.3.3
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion1.3.3
title: NET NGenAssemblyUsageLog Registry Key Tamper
id: 28036918-04d3-423d-91c0-55ecf99fb892
status: test
description: |
Detects changes to the NGenAssemblyUsageLog registry key.
.NET Usage Log output location can be controlled by setting the NGenAssemblyUsageLog CLR configuration knob in the Registry or by configuring an environment variable (as described in the next section).
By simplify specifying an arbitrary value (e.g. fake output location or junk data) for the expected value, a Usage Log file for the .NET execution context will not be created.
references:
- https://bohops.com/2021/03/16/investigating-net-clr-usage-log-tampering-techniques-for-edr-evasion/
author: frack113
date: 2022-11-18
modified: 2023-08-17
tags:
- attack.persistence
- attack.defense-evasion
- attack.t1112
logsource:
product: windows
category: registry_set
detection:
selection:
TargetObject|endswith: 'SOFTWARE\Microsoft\.NETFramework\NGenAssemblyUsageLog'
condition: selection
falsepositives:
- Unknown
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/registry/registry_set/registry_set_net_cli_ngenassemblyusagelog.yml